JPH09192852A - Forming cutter of pimpled electrode tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter capable of improving finish precision of a cut face in a short time by making removal of chips smooth during cutting. SOLUTION: In the cutter to simultaneously form both electrode tips by rotating the cuter while being held between two pieces of electrode tips by pressurizing with a welding machine, conical holes 2 are respectively formed on both faces of a disk shaped body 1, a bottomed recessed part 3, which coincides with a diameter and height of the pimpled electrode tip, is formed to the center part of the conical hole, further, plural cutting blades 4 having circular arc shape by a plane view are respectively formed on the surface of the conical hole radially around the bottomed recessed part at an interval 4A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode tip for a resistance welding machine, and more particularly to a molding cutter for molding the tip of a pimple-type electrode tip.

[0002]

2. Description of the Related Art The tip of an electrode tip used in a resistance welding machine, particularly a spot welding machine, has a dome shape, a trapezoid shape, a pimple (navel) shape, etc., but this electrode tip continues welding under pressure. And the tip surface gradually wears out, resulting in poor welding. In this case, in the dome-shaped and trapezoidal-shaped electrode tips, the surface area of the tip thereof gradually increases as it wears, and the welding state deteriorates sharply.

On the other hand, the pimple-shaped electrode tip has almost no change in the surface area of the tip while the tip of the tip is worn and the belly portion remains, so that the electrode tip is in a welded state as compared with the dome-shaped and trapezoid-shaped electrode tips. Is relatively well maintained and highly stable. Also, when welding a plated plate, the alloy layer is formed on the tip of the electrode tip, resulting in poor welding, but with the pimple-type electrode tip, the tip of the navel naturally flips into a mushroom shape during the welding process, and sticks. It is suitable for welding plated plates because it has a great effect of self-recovery that naturally removes stains.

However, this pimple-type electrode tip is
There is a drawback that the effect cannot be exhibited unless the navel diameter and height are set to the necessary minimum. However, the resistance welding machine actually used is a pressure type of X type or C type, and the contact angle of the tip of the electrode tip is various, so a pimple type with a navel previously formed The electrode tip of (1) has a problem that it is difficult to align the upper and lower or left and right navels that are facing each other when the electrode tip is attached to the welding machine.

Therefore, a pimple-type electrode tip was not used, but an electrode without pimples was attached to a resistance welding machine, and a cutter having cutting blades that cut into pimple-type on both upper and lower surfaces was sandwiched between the upper and lower electrodes. Since the method of cutting out the pimples has been developed, the pimple-type electrode tip has come to be used.

[0006]

However, in the case where the pimples are machined by the above-mentioned method, it takes a long time to machine the machine because the cutting amount for carving the pimples is large. There were various problems such as low finish accuracy of the cut surface.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and enables smooth removal of chips during the cutting process and a short cutting time. The purpose of the present invention is to provide a machine with improved finishing accuracy.
A cutter for simultaneously forming both electrode tips by rotating them while being sandwiched between the electrode tips of the book by the pressure of the welding machine, and forming a mortar-like hole on both sides of a disc-shaped body. , A bottomed concave portion that matches the navel diameter and height of the pimple-shaped electrode tip is formed in the central portion of the comb-shaped hole, and the bottomed concave portion is formed on the surface of the comb-shaped hole that follows the bottomed concave portion. A cutter for molding a pimple-shaped electrode tip is characterized in that a plurality of cutting blades each having a circular arc shape in a plan view are radially formed as a center and are spaced apart from each other.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in FIGS. 1 and 2. In the drawings, A is a cutter for molding a pimple-type electrode tip according to the present invention, which is a disc-shaped body. The upper and lower surfaces of 1 are respectively formed with holes 2 and 2 in the shape of a brim, and the center of the holes 2 and 2 in the shape of a brim (protrusion) corresponding to the welding spot in the pimple-shaped electrode tip is formed. The bottomed recesses 3 and 3 each having a predetermined diameter and depth corresponding to the diameter and height are formed.

Reference numeral 4 denotes a plurality of cutting blades (about 3 to 20) provided on the surface of the hole 2 in the shape of a platter, which are arcuate in plan view, and each cutting blade 4 is for cutting chips. It is provided at equal intervals with an interval 4A and radially around the bottomed recessed portion 3. Reference numeral 5 denotes a key groove provided on the outer periphery of the disc-shaped body 1, and the key groove 5 is formed as a part of a rotational force applying mechanism for applying a rotational force to the molding cutter.

In the above description, the disk-shaped body 1 is composed of one member, but as shown by the one-dot chain line in FIG. 2, the two disk-shaped members 1A and 1A are joined to each other on the back surface thereof. 1 may be formed, and each of the disc-shaped members 1A, 1A may be provided with the above-mentioned mortar-shaped hole 2, bottomed concave portion 3, and arc-shaped cutting blade 4, respectively. Further, the means for forming the bottomed recessed portion 3 may also be formed by forming a through hole in the central portion of the disk-shaped body 1 or the disk-shaped members 1A, 1A and closing the through-hole with another plug member. .

A molding cutter according to the present invention, for example, as shown in FIG. 3 disclosed in Japanese Patent Application No. 60-248551 (Japanese Patent Publication No. 4-33552) filed by the applicant earlier, is shown in FIG. It is used by mounting it on the automatic forming device B of the shaped electrode tip.

That is, the molding cutter A according to the present invention is inserted into the cylindrical member 8 connected to the rotary actuator 6 of the automatic forming apparatus B via the gear 7, and the molding cutter A is pressed with the key 9. It is fixed in the cylindrical member 8. In this state, the molding cutter A according to the present invention is installed between the upper and lower electrode tips 10, 10 set in a resistance welding machine (not shown). Then, the tips of the upper and lower electrode chips 10, 10 are respectively applied to the cutting blades 4, 4 of the molding cutter A, and then the upper and lower electrode chips 10, 10 are closed and pressed in the same manner as during welding.

When the rotary actuator 6 is operated in this state, the molded cutter A is first rotated in one direction,
Then, since it is inverted and rotated in the other direction, by repeating this, the tips of both the upper and lower electrode tips 10, 10 are cut leaving a portion corresponding to the welding diameter at the center portion to form a predetermined pimple shape.

In this cutting process, the forming cutter A
Since each of the cutting blades 4 has a circular arc shape and is provided radially, the chips at the time of cutting are separated from each other by the gap 4A provided between the cutting blades 4 by the component force of the cutting blades 4 at the time of cutting.
It is easy to be naturally excluded from the part in the lateral direction. for that reason,
Even if the cutting resistance is low and the cutting efficiency is improved, it is possible to perform high-speed and clean cutting with good surface accuracy.

When the molding is completed, both electrode chips 10, 10
Of the molding cutter A is stopped by stopping the pressurization of the molding cutter A, the space between the electrode chips 10 and 10 is opened, and the automatic forming apparatus B is pulled out from the space between the electrode chips 10 and 10 to perform the molding operation by the molding cutter. Is completed.

[0016]

As described above, the pimple-type electrode tip molding cutter according to the present invention is rotated by being rotated between two electrode tips of the resistance welding machine while being pressed by the welding machine. It is a cutter that molds both electrode tips at the same time, and if a mortar-shaped hole is formed on both sides of the disk-shaped body, the navel diameter and height of the pimple-shaped electrode tip are centered at the center of the mortar-shaped hole. A bottomed concave portion which is aligned with the bottomed concave portion, and a plurality of cutting blades having an arc-shaped plan view at intervals with a radial shape centered on the bottomed concave portion on the surface of the brim-shaped hole following the bottomed concave portion. Since they are formed respectively, it is possible to form the pimple-shaped electrode tip in the welding machine while automatically and accurately performing centering on the hem and the end portion following it. The removal of chips in the cutting process It becomes over's, can be molded in a short time to and precision is enhanced cutting efficiency. In addition, the disk-shaped body is divided into two cutters on the plane perpendicular to the axis of the bottomed recess, so that the cutter can be easily manufactured, and when the cutting blade is damaged. Is economical because it only needs to replace the damaged one.

[Brief description of the drawings]

FIG. 1 is a plan view of a molding cutter for a pimple-type electrode tip according to the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is a longitudinal sectional view showing a use state.

[Explanation of symbols]

 A Molding cutter 1 Disc-shaped body 1A Disc-shaped member 2 Abrasion-like hole 3 Bottom recess 4 Arc-shaped cutting blade 4A Interval 5 Key groove

Claims (3)

[Claims] 1. A cutter for simultaneously molding two electrode tips of a resistance welding machine while sandwiching the two electrode tips by pressure applied by the welding machine to simultaneously form the two electrode tips. When each of the hole-shaped holes is formed, a bottomed concave portion matching the navel diameter and height of the pimple-shaped electrode tip is formed at the center of the hole of the brim-shaped hole. A cutter for molding a pimple-shaped electrode tip, characterized in that a plurality of cutting blades, which are arcuate in a plan view, are formed at intervals on the surface of the hole in a radial pattern centering on the bottomed recess. 2. The cutter for molding a pimple-shaped electrode tip according to claim 1, wherein the disk-shaped body is configured to be divided into two cutters on a plane perpendicular to the axis of the bottomed recess. 3. The pimple-shaped electrode tip molding cutter according to claim 1, wherein a rotating force applying mechanism is provided around the disk-shaped body.